Earthquake Sound SWS-8Xi 8-inch Shallow Woofer System Under-the-Seat Subwoofer, 2-Ohm (Single) Car audio subwoofer with shallow 2-1/8" mounting depth - low-profile for placement anywhere Inverted style cone design for maximum excursion in shallow mount applications; Protected by 3 US Patents 150 Watts RMS (300 Watts MAX) with 2-Ohm impedance Satisfying, punchy bass from a small package NOMEX/ROMEX spider assembly